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CA2386477A1 - Feedback compensation detector for a direct conversion transmitter - Google Patents

Feedback compensation detector for a direct conversion transmitter

Info

Publication number
CA2386477A1
CA2386477A1 CA002386477A CA2386477A CA2386477A1 CA 2386477 A1 CA2386477 A1 CA 2386477A1 CA 002386477 A CA002386477 A CA 002386477A CA 2386477 A CA2386477 A CA 2386477A CA 2386477 A1 CA2386477 A1 CA 2386477A1
Authority
CA
Canada
Prior art keywords
signal
baseband
direct
impairment
output signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002386477A
Other languages
French (fr)
Other versions
CA2386477C (en
Inventor
Jorgen S. Nielsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Research in Motion Ltd filed Critical Research in Motion Ltd
Publication of CA2386477A1 publication Critical patent/CA2386477A1/en
Application granted granted Critical
Publication of CA2386477C publication Critical patent/CA2386477C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a duadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.
CA002386477A 2001-05-15 2002-05-15 Feedback compensation detector for a direct conversion transmitter Expired - Lifetime CA2386477C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29123901P 2001-05-15 2001-05-15
US60/291,239 2001-05-15

Publications (2)

Publication Number Publication Date
CA2386477A1 true CA2386477A1 (en) 2002-11-15
CA2386477C CA2386477C (en) 2004-11-23

Family

ID=23119490

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002386477A Expired - Lifetime CA2386477C (en) 2001-05-15 2002-05-15 Feedback compensation detector for a direct conversion transmitter

Country Status (2)

Country Link
US (5) US6987954B2 (en)
CA (1) CA2386477C (en)

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Also Published As

Publication number Publication date
US7725087B2 (en) 2010-05-25
US8526896B2 (en) 2013-09-03
CA2386477C (en) 2004-11-23
US20060063497A1 (en) 2006-03-23
US20030045249A1 (en) 2003-03-06
US20120253736A1 (en) 2012-10-04
US6987954B2 (en) 2006-01-17
US20090262861A1 (en) 2009-10-22
US20100233974A1 (en) 2010-09-16
US8219044B2 (en) 2012-07-10

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Effective date: 20220516